eyes in the back of one's head, have

Be more aware of what is happening than is generally realized. For example, Even when he's away he always knows what the staff are doing—he has eyes in the back of his head, or With such hostile colleagues she needs to have eyes in the back of her head. [Mid-1500s]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.